1956年,当时的华北地质局204队在内蒙古锡林郭勒盟温都尔庙西南12公里处(东经112.5°,北纬43)采得一些[竹蜓]科化石,由笔者鉴定。这些[竹蜓]科,个体众多,仅有一种,即Parafusulina rothi Dunbar and Skinner,并无其他化石共生。这一...1956年,当时的华北地质局204队在内蒙古锡林郭勒盟温都尔庙西南12公里处(东经112.5°,北纬43)采得一些[竹蜓]科化石,由笔者鉴定。这些[竹蜓]科,个体众多,仅有一种,即Parafusulina rothi Dunbar and Skinner,并无其他化石共生。这一化石在这个地区还是初次发现。展开更多
in this paper,we investigate ideals of regular rings and give several characterizations for an ideal to satisfy the comparability.In addition,it is shown that.if I is a minimal two-sided ideal of a regular ring R,then...in this paper,we investigate ideals of regular rings and give several characterizations for an ideal to satisfy the comparability.In addition,it is shown that.if I is a minimal two-sided ideal of a regular ring R,then I satisfies the Comparability if and only if I is separative.Furthermore,we prove that.for ideals with stable range one.Roth's problem has an affirmative solution.These extend the corresponding results on unit-regularity and one-sided unit-regularity.展开更多
文摘1956年,当时的华北地质局204队在内蒙古锡林郭勒盟温都尔庙西南12公里处(东经112.5°,北纬43)采得一些[竹蜓]科化石,由笔者鉴定。这些[竹蜓]科,个体众多,仅有一种,即Parafusulina rothi Dunbar and Skinner,并无其他化石共生。这一化石在这个地区还是初次发现。
基金supported by the National Natural Science Foundation of China (GrantNo.19801012)the Ministry of Education of China
文摘in this paper,we investigate ideals of regular rings and give several characterizations for an ideal to satisfy the comparability.In addition,it is shown that.if I is a minimal two-sided ideal of a regular ring R,then I satisfies the Comparability if and only if I is separative.Furthermore,we prove that.for ideals with stable range one.Roth's problem has an affirmative solution.These extend the corresponding results on unit-regularity and one-sided unit-regularity.
